Credit-Card Management App

The problem

Card management is a details game: which card to use, what benefit applies, which limit is close, when a window closes. People keep it in their heads and lose money to the gaps. A product that fixes this has to be trustworthy on day one, which for a money-adjacent tool means it must feel considered end to end rather than like a spreadsheet with a login.

How we built it

We wrote the whole thing in TypeScript so the data shapes that describe cards, limits and benefits are enforced rather than assumed, which is the right bar for a product that reasons about money. The application is paired with a complete marketing site — hero, how-it-works, about, FAQ and contact — and a GDPR-aware cookie-consent flow, so the first impression is a finished product rather than a bare app. Guided onboarding tours carry a new user through their first setup, product analytics tell us where they stall, and cached data fetching keeps the wallet view fast as it grows.

• Track every card, credit limit and benefit in one wallet view
• Complete marketing site: hero, how-it-works, about, FAQ and contact
• GDPR-aware cookie-consent flow
• Guided onboarding tours for first-run setup
• Product analytics to find where users stall
• Payments and cached, responsive data fetching

• React
• TypeScript
• Stripe
• PostHog
• TanStack Query
• Uppy

It ships as a finished fintech product rather than a prototype: typed end to end, with a marketing front door, consent handling and onboarding already in place, so the first session reads as trustworthy — which for a money tool is the whole battle.